Make cofunctionals terminal, and test #300
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When taking derivatives with respect to a
Cofunction, ufl ends up creatingExprListobjects containing cofunctions. Equality (==) then fails on theExprListbecause theCofunctionis not identified as a terminal. This fixes that and puts in a test.Also adds unicode methods for a couple of missing things that were hit along the way. The whole unicode conversion is untested and I'm not proposing to fix that here.